Sample tube rack



FIG. 1 is a perspective view of a sample tube rack showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is an end view thereof; and,

FIG. 7 is an opposite end view thereof. 

The ornamental design for a sample tube rack, as shown and described. 